Hi vesst92,
We'd like to help guide you in the best direction for a solution. If you are unable to get passed this option on startup, you will want to start with checking to see if the disk needs repaired, and you can do so with these steps: How to repair a Mac disk with Disk Utility. If this issue remains after and being unable to access any user accounts, this would indicate a system wide issue, and reinstall of the macOS will be next here: How to reinstall macOS. If an issue continues, you'll want to reach out to Apple Support. You can use the link below, if needed.
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